RepRap Morgan ramps 1.4 Marlin goes nuts

Greetings.

Around 2012 I decided that I want to build my own 3d printer, so I bought 3x nema17 (not knowing you kinda needed 4 minimum) and was going to build the RepRap Eventorbot. Then my pc broke and I spent all my money on that (as back then gaming > life =\ ).

Fast forward 2-3 years and I find my stepper motors gathering dust in the cupboard and decided that now would be a good time to restart my 3d printer building adventures. After some digging, I landed on the RepRap Morgan page and I was hooked. It’s movement while printing is mesmerizing and as a fellow South African…some patriotism was part of the decision making me thinks.

How ever thing does not always go according to plan. I mean as a 3rd year varsity student (UCT) I should have plenty of spare time…*cough cough*…and it took me 8+ months to source and build it to a point where I can start testing the hardware.

Tadaaa!


Now onto the main topic of this forum post…
-When Trying to home…the steppers just whine (high pitched) and don’t move (Yes I have checked the vPot’s, they are set correctly)
-When I try and move the arms with gcode…it proceeds to try and rip it’s own head off. Regardless of the endstops (and yes I did do the steps tuning bit, currently sitting on (456,456,456,450))

Any ideas?
I’m completely lost.

Are you using standard marlin or the custom one linked from the Morgan webage. ?

If normal marlin...

You homing feed rate is probably to high, ie [github.com]

Did you notice the line ?

// For a Scara printer replace the configuration files with the files in the
// example_configurations/SCARA directory.

Otherwise your using the wrong kinematics (maths behind how it moves) and it will move very weirdly

Then you have to set the following section to match your hardware (arm lengths and the like)
[github.com]

Edited 1 time(s). Last edit at 04/07/2016 08:56PM by Dust.

@Dust

I'm using the marlin that is on Quintin's Github (ie the Morgan flavor). How ever it is 2 years old...I wonder...you think I should move over to a newer marlin and just edit it for the Morgan?

For now I'll try your advice on the adjustments, will keep you posted.

Sooo...after many attempts, I still could not make any progress...

Here is a video of whats happening
youtube link

When homing the motor's just wine. After moving and triggering everything manually it finally accepts that it is homed...but then When I try and tell it to move 10 mm...all hell breaks loose.

That fumbling at the end is just me trying to stop the thing from destroying it self.


Any ideas. I'm losing it.